style: black format test files

tests/unit/test_cover_service.py

@@ -144,6 +144,7 @@ class TestExtractCoverFromClip:
 
         # mock _extract_frame 避免真的调 ffmpeg
         with patch.object(CoverService, "_extract_frame") as mock_extract:
+
             def fake_extract(video_path, output_path, **kwargs):
                 # 创建假的封面文件
                 with open(output_path, "wb") as f:
@@ -154,9 +155,7 @@ class TestExtractCoverFromClip:
             with pytest.raises(RuntimeError, match="上传封面失败"):
                 service.extract_cover_from_clip(plan_id="plan-1", asset_id="asset-1")
 
-    def test_extract_cover_get_url_falls_back_to_key(
-        self, service, mock_asset_repo, mock_storage, video_asset
-    ):
+    def test_extract_cover_get_url_falls_back_to_key(self, service, mock_asset_repo, mock_storage, video_asset):
         """测试获取 URL 失败时降级为 storage_key"""
         mock_asset_repo.get.return_value = video_asset
 
@@ -169,15 +168,14 @@ class TestExtractCoverFromClip:
         mock_storage.get_url.side_effect = Exception("URL服务不可用")
 
         with patch.object(CoverService, "_extract_frame") as mock_extract:
+
             def fake_extract(video_path, output_path, **kwargs):
                 with open(output_path, "wb") as f:
                     f.write(b"\xff\xd8\xff\xe0fake jpeg")
 
             mock_extract.side_effect = fake_extract
 
-            result = service.extract_cover_from_clip(
-                plan_id="plan-abc", asset_id="asset-xyz", frame_time=2.5
-            )
+            result = service.extract_cover_from_clip(plan_id="plan-abc", asset_id="asset-xyz", frame_time=2.5)
 
         assert result["type"] == "manual"
         assert result["frame_time"] == 2.5
@@ -197,6 +195,7 @@ class TestExtractCoverFromClip:
         mock_storage.download_file.side_effect = fake_download
 
         with patch.object(CoverService, "_extract_frame") as mock_extract:
+
             def fake_extract(video_path, output_path, **kwargs):
                 with open(output_path, "wb") as f:
                     f.write(b"\xff\xd8\xff\xe0fake jpeg image data")

tests/unit/test_login_use_case.py

@@ -169,9 +169,7 @@ class TestLoginUseCase:
         assert response is None
         assert error == "Invalid email or password"
 
-    def test_login_legacy_sha256_password_success_and_upgrade(
-        self, use_case, mock_user_repo, mock_session_store
-    ):
+    def test_login_legacy_sha256_password_success_and_upgrade(self, use_case, mock_user_repo, mock_session_store):
         """测试旧版 SHA256 密码登录成功并自动升级哈希"""
         legacy_hash = _legacy_sha256("OldPassword123")
         legacy_user = User(